Stem winding and setting watch.



W. B. PORTER.

STEM WINDING AND SETTING WATCH.

APPLICATION FILED SEPT.30,1908.

Patented Apr. 27, 1909.

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UNITED s'rArns Parana? onrrcn.

WILSON E. PORTER, OF NEW HAVEN, CONNECTICUT, ASSIGNOR TO NEW HAVEN CLOCKCO., OF NEW HAVEN, CONNECTICUT, A CORPORATION.

STEM WINDIN G AND SETTING WATCH.

To all whom it may concern:

Be it known that I, l hrsow E. Ponrnn, a citizen of the United States,residing at New Haven, in the county of New Haven and State ofConnecticut, have invented a new and useful Improvement in Stem-Viindingand StemSetting atches; and I do hereby declare the following, whentaken in connection with the accompanying lrawings and the numerals ofreference marked thereon, to be a full, clear, and exact description ofthe same, and which said drawings constitute part of this specification,and represent, in

Figure 1 a view in rear elevation of a watch. constructed in accordancewith my invention, with the back-cap removed. Fig. 2 a broken view ininside elevation of the back movement-plate, the bridge being indicatedby broken lines. Fig. 3 a broken edge view showing the dog in itsrelation to the main winding-wheel. Fig. 4 a broken plan view of the dogand its shaft. Fig. 5 a detached view in elevation of the dog.

My invention relates to an improvement in stem-winding and stem-settingwatches, the object being to provide simple, durable and reliable meansfor ireventing the mainspring from being wound too tight.

With these ends in view my invention consists in a stem-winding andstem-setting watch having certain details of construction andcombinations of parts as will be hereinafter described and pointed outin the claims.

In carrying out my invention as herein shown, I employ a disk-like dog 2formed with a stop lug 3 and a relaxing tooth 4. located adjacent to thenear end, as I may say, f the lug 3. The stop dog is mounted upon rockshaft iournaled at one end in the front movement-plate 6 and at itsopposite end in a bridge or supplemental plate 7 held in place by two ofthe screws 8 which secure the back movement-plate 9 to two of thepillars 10 of the movement. In other words, two of the screws which areem ployed to fasten the back movement-plate to the pillars, are alsoemployed for securing the bridge in place. v i hen in place the saidbridge rests upon the back or outer face of the said back-movementplate.

The dog 2 is located so that the main winding-wheel 11 as it is turnedin winding, rides over the lug 3 and tooth 4 of the dog which isreturned to its normal position every time a tooth of the said wheelsnaps Specification of Letters Patent.

Application filed September 30, 1908.

Patented April 27, 1909.

Serial No. 455,507.

over it, by a spring 12 encircling the shaft 5 at one end, and at itsother end wound about one of the pillars 10 of the movement. This springhowever, may be constructed and arranged in a variety of ways as long asit is adapted to cause the dog to recover after a tooth of thewinding-wheel 11. has passed over it. The said main winding-wheel 11 ismeshed into by an intermediate winding wheel 13 constantly engaged by awinding pinion 14 fixed upon the inner end of a rotatable andlongitudinally movable stem 15 located within the pendant 16 andfurnished at its outer end with a winding crown 17. However theparticular means employed for rotating the main win ding-wheel hasnothing to do with my present invention.

One end of the main-spring which is not shown, is connected with themain windingwhecl 1.1, while its opposite end is connected with thetime-wheel 19 which meshes into the center pinion (not shown) of thetime-train. It will be understood that in winding the mainspring, theteeth of the wheel 1 1 ride over the tooth 1 of the dog 2 and effect aconstant oscillation of the dog in conjunction with the spring 12 beforementioned.

When winding pressure is taken off the crown 17, the main-springimmediately asserts itself and turns the wheel 11 in the revcrsedirect-ion, whereby the tooth of the said wheel which is at the time infront of the relaxing tooth 4 of the dog 2, ii'ninediately turns the dogfrom left to right, and thus jams the lug 3 of the dog into the adjacentteeth of the wheel so as to lock and hold the wheelagainst furtherreverse rotation. This locking engagement oi the lug 3 of the dog 2 withthe teeth of the wheel 11 does not, however, take place until after thesaid wheel has been reversely rotated for a short distancefor a distancesufficient to relax the tension upon the winding spring to the degreerequired for preventing it from breaking. This construction also avoidsthe over-banking, as it is termed, of the balancewheel of the watch,resulting from an excess of pressure upon the time-train due tooverwinding the mainspring and causing the movement to run too fastuntil this over-pressure has spent itself. By employing two or morerelaxing teeth 1 instead of one, as shown, the lug 3 would be carriedfarther out of range of the teeth of the wheel 11 and consequently wouldpermit a greater reverse rotation of the same before its reengagementtherewith and arrest thereof, whereby a greater relaxation of thewinding spring would be effected. However I have found the employment ofone relaxing tooth 4 close to the near end of the lug 3 sufiicient toprevent over-winding.

As shown, the disk-like dog 2 is formed with a narrow radial slot 20arranged to be exposed through a cut 21 in the mo vement plate 9 so thatat any time that it is desired to let the spring down any convenientinstrument, such as the end of a small screw-driver, might be insertedinto the slot 20 and the dog turned against the tension of its spring 12so as to disengage its lug 3 and tooth 4 from the teeth of the mainwinding wheel 11 and per mit the same to be rev ersely rotated until thespring has been unwound.

It will be observed that the back movement-plate is cut away under thebridge or supplemental plate 7 so as to permit the main winding-wheel 11and the dog 2 to be located in the plane of the back movementplate.

I claim 1. In a stem-winding and stem-setting watch, the combinationwith the front and back movement-plates thereof, of a bridge bearingupon the back or outer face of the said back movement-plate, a mainwindingwheel, a rock-shaft having its respective ends journaled in thesaid bridge and front move ment-plate, a spring-actuated oscillating dogmounted upon the said rock-shaft and lo cated between the said frontmovementplate and bridge in position to bear against the inner face ofthe said bridge, and the said dog being formed with a stop-lug and arelaxing-tooth for coaction with the teeth of the said wheel.

2. In a stem-winding and stem-setting watch, the combination with themovementplates thereof, of a main winding wheel, a spring-actuatedoscillating disk-like dog located between the said plates and providedwith a stop-lug and a relaxing-tooth and formed with an operating slotfor the reception of an instrument by means of which the dog may bemanually operated for the reverse rotation of the main winding-wheel,and a shaft upon which the dog is mounted, the ends of the said shaftbeing carried by the respective movement plates.

In testimony whereof, I have signed this specification in the presenceof two subscribing witnesses.

W'ILSON E. PORTER. Witnesses GEORGE D. SEYMOUR, OLA-RA L. WEED.

